Hello, fellas. Our session today is about some vocabularies with similar meaning – the same, similar, like, and alike – and how to use them in a sentence.
The same and similar are adjectives. However, same is always preceded by the.
1) Jane and Mary have the same personalities.
2) Jane and Mary have similar personalities.
3) Their personalities are the same.
4) Their personalities are similar.
The other difference between the same and similar lies in the prepositions following them. As comes after the same, while to follows similar.
1) Your smartphone is the same as mine.
2) Your smartphone is similar to mine.
There may be a noun between the same and as.
Jane is the same age as Mary.
There is a slight difference between like and alike. Like precedes a noun, but alike never comes before a noun.
1) The house looks like a palace.
2) The two sisters are alike.
Betty Schrampfer Azar, Fundamentals of English Grammar: Third Edition
Deborah Phillips, Longman Complete Course for the TOEFL Test